Hello,
As you know the linked mode between vCenter components is for management. and with 6.7 they recommend the embedded platform to minimize the size of deployment.
But if your environment is with external configuration and enhanced linked mode, you can upgrade to 6.7 as it because 6.7 supports the enhanced linked mode and external PSC configuration.
Then you have to plan the conversion to embedded using the Converge Tool.
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Cheers,
VCIX6-NV|VCP-NV|VCP-DC|
@KakHassan
linkedin.com/in/hassanalkak
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Regards,
Hassan Alkak